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【单选题】
A、B、C、D均为短周期元素。A、B可形成两种液态化合物B 2 A 2 、B 2 A，A与C仅形成两种气态化合物CA、CA 2 ，B可分别与A、C、D形成电子数相等的三种分子X、Y、Z，其中Y的空间结构是正四面体。则下列叙述正确的是 [ ]A.
X、Y、Z的稳定性逐渐减弱、熔沸点逐渐升高
B.
分子式为D 2 B 4 A 3 的物质水溶液呈碱性
C.
自然界中不会存在由A、B、C、D四种元素的组成的化合物
D.
A、B、C、D所形成的单质中，有上图所示的一种晶体结构
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【单选题】关于匙状甲的叙述，下列哪项是错误的
A.
又称反甲
B.
其特点为末端指节明显增宽、增厚
C.
其特点为指甲中央凹陷，边缘翘起
D.
指甲变薄，表面粗糙，干脆有条纹
E.
常为组织缺铁或某些氨基酸代谢紊乱所致营养障碍
【单选题】关于匙状甲的叙述,下列哪项是错误的?( )
A.
又称反甲
B.
其特点为末端指节明显增宽、增厚
C.
其特点为指甲中央凹陷，边缘翘起
D.
指甲变薄，表面粗糙有条纹
E.
常为组织缺铁或某些氨基酸代谢紊乱所致营养障碍
【简答题】Read the paragraph. Then answer the questions below. (1) The Panama C changed ocean travel for people and goods. (2) The American-built c connected the Atlantic and Pacific Oceans. (3) Ships n...
【单选题】This passage tells us ______.
A.
it was the Panama Canal that made the country independent
B.
It's nearly a century since Panama declared its independence
C.
Panama was named by Columbus
D.
Colombia used to be a state of the United States
【单选题】Read the paragraph. Then answer the question below. (1) The Panama Canal changed ocean travel for people and goods. (2) The American-built canal connected the Atlantic and Pacific Oceans. (3) Ships no...
A.
Ocean travel
B.
The American-built canal
C.
The Panama Canal changed ocean travel
【简答题】ships sized to get through the Suez C are called ( ),and those sized to get through the Panama C are called ( ).
【单选题】The Panama Canal was built by a ( ) consortium.
A.
America
B.
Italy
C.
Britain
D.
France
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